Aim: To assess the validity and reliability of cephalometric measurements performed by CephNinja, OneCeph and EasyCeph applications with lateral cephalometric radiographs based on measurement obtained from veiwbox computer software. 
Subjects & methods: 50 patients' pre-treatment lateral cephalograms using the same 
digital cephalometer were collected. Patients were traced twice using three mobile apps 
(i.e., CephNinja and OneCeph, Easyceph), with Viewbox used as the reference standard 
computer software program. 11 angular and 2 linear measurements originating from 
the Downs analysis, Ricketts analysis and Wits appraisal. Results: There were no statistically significant differences were found between the mobile application and computer software which states a strong validity and agreement between the two readings. 
Conclusion: Smartphone cephalometric analysis applications perform satisfactorily in 
terms of validity and reliability. OneCeph is highly valid when compared with Viewbox 
as a control group than other two mobile apps, while both mobile apps Oneceph and 
CephNinja are more reliable than Easyceph.